基于CFD的船用離心泵葉輪抗汽蝕優(yōu)化設(shè)計(jì)
[Abstract]:Centrifugal pumps are widely used in modern ships and account for a large proportion of the ship's manufacturing and energy consumption. The cavitation phenomenon of the impeller of marine centrifugal pump has been one of the important reasons that affect the performance of the centrifugal pump. In this paper, the internal flow field of the centrifugal pump is analyzed and calculated by using the research method based on CFD. The optimum design scheme for improving cavitation corrosion resistance of centrifugal pump impeller is put forward, which is of great significance to the research of centrifugal pump. In this paper, three parameters of centrifugal pump impeller, such as blade number, inlet width and inlet shape, are selected for analysis and calculation. The main research work is as follows: 1. The structural characteristics of marine centrifugal pump are studied. The cause and harm of cavitation of centrifugal pump are analyzed, and the research progress and research status of anti-cavitation performance of marine centrifugal pump at home and abroad are discussed. 2. Master the use method and related modeling method of 3D design software SolidWorks, and use the software to model the impeller and volute runner. 3. CFD oriented GAMBIT software is used to mesh the impeller and volute flow channel model, including the setting of inlet and outlet and the interface between the impeller and the volute. (4) the gridded flow channel model entity is imported into Fluent software to analyze the internal flow field, including setting the physical properties, boundary conditions and calculation methods of the transported medium. 5. By analyzing the pressure and velocity distribution diagram of impeller and volute flow channel obtained by numerical simulation, combining with the change of centrifugal pump's lift and efficiency parameter, the optimum design scheme of centrifugal pump impeller is put forward. The main conclusions obtained in this paper are as follows: according to the analysis of CFD, the number of impeller blades should be increased properly, the inlet width of impeller passage of centrifugal pump should be properly increased, and the inlet width of centrifugal pump impeller should be increased. The cavitation resistance of centrifugal pump impeller can be improved by adopting proper inlet shape of impeller runner, and other working performance of centrifugal pump can not be greatly affected or even improved. In the mechanical structure design of centrifugal pump, the flow field performance of the designed model is calculated by using CFD method to make up for the shortcomings of the traditional design method, which can effectively shorten the design period and reduce the design cost.
【學(xué)位授予單位】:大連海事大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類(lèi)號(hào)】:TH311;U664.58
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